Phorid is the final boss of Eris, inhabiting Naeglar. Resembling an oversized and overbuffed Infested Charger, it bears a possibility of dropping blueprints for the Nyx Warframe and Neurodes resources.
J3-Golem is the final boss of the planet Jupiter. He can be found on Themisto. He has a possibility of dropping one of the following on death: Volt Helmet, Volt Chassis and Volt Systems blueprints and Neural Sensors. He has also been known to drop 2x mods. He is thought to be the oldest boss, dating back to the Orokin Era.